In order to fully appreciate the Field of View for which the lens has been designed, make sure you are placing the lens at the right working distance. Every lens has a unique working distance where you can see the field specifications. If you are away from the right working distance, your field of view gets clipped thus resulting in the experience you described. If you are too close, the peripheral view appears dark and unclear. Many doctors start by holding the BIO lens close to the eye and then move away until they are able to fill the lens with the entire field.